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Eat pizza, chat with the guests... well, chat with Claptrap.
http://support.2k.com/hc/en-us/articles/201336283-Optional-Mission-Claptrap-s-Birthday-Bash-Cannot-complete-mission
Also, have you tried making sure the host is the one carrying out the deeds? There were four of us in one friend's game recently, and we managed to fail it somehow. One of us was not at the party site, but the rest of us were - maybe that's a thing, making sure all the vault hunters are there?
The host wasn't doing all the stuff herself, though, so we began to suspect that might have been the thing, especially once I did it shortly after by myself, just doing all the things I did when I was in her game.